JP2002038275A - Disk support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk support which surely supports a disk. SOLUTION: The disk support 3 comprises an approximately round bar with a groove 4 which is formed around its whole outer circumferential face to support an inner edge 34 of a magnetic disk substrate 33 (a circle). A central part of a bottom face 4a of the groove 4 in a section view, comprises a convex surface swelled against both sides of the bottom face 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk support used for processing a disk-shaped member having an open inner periphery, for example, for plating a disk substrate used for a magnetic disk or the like.

[0002]

2. Description of the Related Art Conventionally, a magnetic disk substrate used for a recording medium of an information processing system is a disk-shaped member having an inner periphery opened, and its surface is coated with a magnetic material before it is applied. Then, an electroless plating process for forming a base is performed.
When plating or other surface treatment is performed on a disk-shaped member (hereinafter simply referred to as a disk) having an inner periphery opened as described above, the entire surface of the disk is not limited to the magnetic disk substrate. It is necessary to expose and hold the entire surface of the disk so that it can be processed. For this reason, for example, in a plating apparatus that performs plating on a disk, two disk-shaped rotary plates that are arranged so as to be substantially horizontal and concentric with respect to each other while being separated from each other, and to be detached between these rotary plates A plurality of substantially round bar-shaped disc supports which are freely wrapped and arranged along the periphery of the rotating plate are provided. The disc support is placed between the rotating plates in a state where the axis is substantially parallel to the axis of the rotating plate, that is, in a state where the axis is substantially horizontal. A groove for receiving the peripheral edge is formed over the entire circumference. The groove is formed, for example, in a V-shape, U-shape, or rectangular shape in cross section, and is provided in a plurality along the axial direction of the disk support so as to support a large number of disks. The outer diameter of the disc support is
The inner diameter of the disk is smaller than the inner diameter of the disk, and a play of an appropriate size is formed between the disk support and the inner peripheral edge of the disk. Here, the rotating plate is driven to rotate around an axis by a driving device. The disk support is attached to the rotating plate so as to allow rotation about the axis, and is driven to rotate about the axis by the driving device.

[0003] In the plating apparatus configured as described above, a disk is attached to a disk support, and the disk together with the rotary plate and the disk support is immersed in a plating tank. By rotating the plate support around the axis, the disk revolves around the axis of the rotary plate by rotation of the rotary plate while rotating by the rotation of the disk support. As a result, the contact area of the disk with the disk support is continuously changed, and the entire surface of the disk including the inner peripheral edge is exposed to the plating solution to perform plating. Here, during the electroless plating process, bubbles such as hydrogen gas are generated on the surface of the disk due to the chemical reaction, and if the bubbles are left, plating unevenness occurs on the surface of the disk. Moving the disk in the plating bath gives a relative flow of plating solution to remove air bubbles from the surface of the disk.

[0004]

The disk is desirably supported with its axis substantially parallel to the disk support. However, as described above, the disk support and the inner peripheral edge of the disk are not supported. Since there is a play between the discs, if the disc is tilted by applying any force to the disc, etc., there is no action to correct the tilt, so return the disc to its original position Could not. In order to prevent such disc tilt,
There is also a plating apparatus provided with a guide shaft that is substantially parallel to the disk support and that additionally supports the outer peripheral edge of the disk supported by the disk support by grooves formed on the outer peripheral surface. Because the plate is eccentric vertically downward with respect to the axis of the disk support shaft under gravity, the disk is separated from the guide shaft depending on the rotation angle of the rotating plate, and the support of the disk becomes insufficient Would. When the process is continued while the disc is tilted, the tilt gradually increases or the discs held in the adjacent grooves (hereinafter, simply referred to as adjacent discs) move in the direction of approaching each other. Adjacent disks come into contact with each other to cause damage to the surface, or the shavings generated at this time may adhere to other disks, adversely affecting other disks. May give. Further, when adjacent disks are inclined in different directions, a part of the disks comes close to each other, and the adjacent disks are likely to come into contact with each other. Further, in some cases, the disc may ride on the outer peripheral surface of the disc support and move to an adjacent groove. In this case,
The plating process is performed in a state where the two discs are in close contact with the opposing surfaces, and the plating process in this portion may be defective.

[0005] A specific example of the behavior of the disk when the disk is tilted will be described below. As shown in the side view of FIG. 5A, in the case of the disk support 31 in which the cross-sectional shape of the groove 32 is V-shaped, the disk 33 usually has the uppermost part of the inner peripheral edge 34. The ridges 34a and 34b are in line contact with both side surfaces 32a and 32b of the groove 32. And FIG.
As schematically shown in the partially enlarged side view of (b), the disk 33 is inclined when viewed from the side, so that the disk 33 is positioned at the uppermost part of the inner peripheral edge 34. Only the ridge portion 34a on the side in the inclined direction comes into line contact with one side surface 32a of the groove 32. Then, the gravity acts in a direction of moving the center of gravity G of the disk 33 directly below the fulcrum P (the point of contact between the inner peripheral edge 34 and the side surface 32a), that is, in a direction in which the disk 33 is inclined. When the disk 33 is tilted, the disk 33 continues to be tilted. Here, in FIG. 5B, a vertical line passing through the fulcrum P is indicated by a reference numeral V. Furthermore, when the inclined state of the disk 33 continues, including not only the case where it is inclined when viewed from the side but also the case where it is inclined when viewed from above, the disk 33 and the disk With the rotation, the contact point between the inner peripheral edge 34 of the disk 33 and the groove 32 becomes
The disk 33 spirally moves on one side surface 32 a of the groove 32 toward the upper end of the groove 32, and finally the disk 33 rides on the outer peripheral surface of the disk support 21, and the disk 33 jumps out of the groove 32. Would. In this case, the locus drawn by the contact point is shown in FIG.
This is indicated by a broken line L in (b). The same applies to the case where the groove has a U-shaped cross section.

[0006] In the case of a disk support member 36 (see the plan view of FIG. 6) in which the cross-sectional shape of the groove 37 is rectangular, the disk 33
Usually, the groove 37 is formed at the uppermost portion of the inner peripheral edge 34.
(See side sectional view in FIG. 7). Then, as schematically shown in FIG. 6, when the disk is tilted when viewed from above, the inner peripheral edge 34 of the disk 33 and the groove 37 are formed with the rotation of the disk 33 and the disk support 36. Is spirally moved toward one side surface 37b of the groove 37, and the disk 33 approaches the side surface 37b. Finally, as shown in FIG. 7, the inner peripheral edge 34 of the disk 33 is caught on the outer peripheral surface of the disk support 36 (the point Q in FIG. 7), and the disk 33 and the disk support 31 are further moved. By rotating, the disk 33 rides on the outer peripheral surface, and the disk 33 jumps out of the groove.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a disk support that can reliably support a disk.

[0008]

In order to solve the above-mentioned problems, a disk support according to the present invention has a substantially round bar shape, and has an outer peripheral surface provided with an inner peripheral edge of a disk having an inner peripheral opening. A disk support in which a groove for receiving is formed over the entire circumference,
The groove is characterized in that a central portion of the bottom surface is formed in a cross-sectional view so as to protrude from both sides of the bottom surface.

In the disk support thus constructed, the disk is usually in line contact with the center of the groove at the center of the uppermost portion of the inner peripheral edge. Since the bottom surface of the groove is formed in a shape in which the central part is raised, if the disk is inclined when viewed from the side, the disk is positioned in the inclined direction in the uppermost portion on the inner peripheral edge. On the other hand, the disc does not contact the bottom face, and the other side contacts the bottom face of the groove, and the disc is supported by the disc support with this portion as a fulcrum. Then, gravity moves the center of gravity of the disk just below the fulcrum,
That is, the disk acts to incline in a direction to cancel the inclination of the disk, and the posture of the disk is returned to the original position. Further, as the disk is tilted as described above, the contact point between the inner peripheral edge of the disk and the groove is raised on the bottom surface of the groove toward one side of the groove with the rotation of the disk and the disk support. Is moved spirally, and the disk is returned to the center of the groove. Also, when the disk is tilted when viewed from above, the contact point between the inner peripheral edge of the disk and the groove spirals toward one side of the groove as the disk and the disk support rotate. Then, the disk comes close to this side surface. However, since the bottom of the groove is formed in a shape in which the central portion is raised, if the disk comes off the central portion of the groove in this manner, the disk is inclined from the side, and the inclination of the disk is reduced. The inclination gradually changes from the inclination seen from above to the inclination seen from the side. By changing the inclination of the disk to the inclination seen from the side in this way, the attitude of the disk is returned to the original as described above. Further, when the groove is formed in a V-shape in cross section as in the conventional case, the space formed around the inner peripheral edge of the disk becomes small, so that the surface treatment of the disk in this portion (for example, plating) Processing, etc.) may deteriorate, but with the disc support of the present invention,
Since a sufficient space can be secured around the inner peripheral edge of the disk, the surface treatment of the disk in this portion can be performed well. Here, the bottom surface of the groove may be formed in a convex curved shape with a raised central portion, or may be formed in a mountain shape having the central portion as a vertex.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk support according to an embodiment of the present invention will be described below with reference to the drawings. Here, in the present embodiment, a magnetic disk substrate is used as a disk, and an apparatus for performing a surface treatment on the magnetic disk substrate includes:
A description will be given of an example of a plating apparatus for performing electroless plating for forming a base on the surface of a disk substrate. FIG. 1 is a longitudinal sectional view showing a schematic configuration of a plating apparatus using a disk support according to the present embodiment, FIG. 2 is a side view showing the disk support according to the present embodiment, and FIG. FIG. 4 is a partially enlarged side view showing a state of supporting the magnetic disk substrate by the disk support, and FIG. 4 is a view showing a state of support of the magnetic disk substrate by the disk support according to the present embodiment;
(A) is a partially enlarged plan view, (b) is a partially enlarged side view. As shown in FIG. 1, the plating apparatus 1 has a pair of support members 1 a provided on the apparatus main body, and two support members 1 a arranged with their axes substantially horizontal and concentric with each other separated from each other by the support members 1 a. Disk-shaped rotating plate 2
And a plurality of substantially round bar-shaped disc supports 3 which are detachably mounted between the rotating plates 2 and are arranged along the peripheral edge of the rotating plate 2.

The rotating plate 2 is supported by a supporting member 1a so as to be rotatable around its axis. Rotating plate 2
Is provided along its periphery with a bearing 2a for holding the end of the disk support 4 detachably while allowing rotation about its axis. The disk support 3 is placed between the rotary plates 2 with the axis substantially parallel to the axis of the rotary plate 2, that is, with the axis substantially horizontal. Inner peripheral edge 3 of disk substrate 33
A groove 4 for receiving the groove 4 is formed over the entire circumference. As shown in FIG. 2, the groove 4 is formed in a convex curved shape in which a central portion of the bottom surface 4 a rises with respect to both side portions of the bottom surface 4 in a sectional view. The groove 4 has a chamfered edge. And in the disk support 3,
A plurality of grooves 4 are provided along the axial direction of the disk support 3 so as to support a large number of magnetic disk substrates 33. The outer diameter of the disk support 3 is
3, and a play of an appropriate size is formed between the disk support 3 and the inner peripheral edge 34 of the magnetic disk substrate 33.

Here, the rotating plate 2 and the disk support 3 are each driven to rotate about an axis by a driving device. In the present embodiment, as shown in FIG.
At least one of the rotary plates 2 has teeth formed over the entire outer periphery thereof. A drive shaft of a drive motor (not shown) is provided with a drive gear 6 meshing with the teeth of the rotary plate 2. Is transmitted to the rotating plate 2 and the rotating plate 2
Are configured to be rotationally driven together with the disk support 3.
Also, a sun gear 7 is fixedly provided on one of the support members 1a coaxially with the rotating plate 2, and a planetary gear 8 meshing with the sun gear 7 is provided at one end of each disk support 3 so that the rotating plate 2 Is rotated to move the planetary gear 8 along the circumferential direction of the sun gear 7, thereby rotating the disk support 3 around its axis. Further, a groove 9a formed on the outer peripheral surface is provided between the rotating plates 2 so as to be substantially parallel to each disk support 3.
Disk substrate 3 supported by disk support 3 by
3 is provided with a guide shaft 9 for supporting the outer peripheral edge.

In the plating treatment of the magnetic disk substrate 33 in the plating apparatus 1 having the above-described structure, the magnetic disk substrate 33 is attached to each groove 4 of the disk support 3, and the rotating plate 2 and the disk support 3 The magnetic disk substrate 33 is immersed in the plating bath, and in this state, the rotating plate 2 and the disk support 3 are respectively rotated around the axis, whereby the magnetic disk substrate 33 is rotated by the rotation of the disk support 3. While rotating, the rotating plate 2 revolves around the axis of the rotating plate 2. In this way, the contact area of the magnetic disk substrate 33 with the disk support 3 is continuously changed, and the entire surface of the magnetic disk substrate 33 including the inner peripheral edge 34 is exposed to the plating solution, and plating is performed. At the same time, the magnetic disk substrate 33 is moved in the plating bath to give a relative flow of the plating solution to remove bubbles from the surface of the magnetic disk substrate 33.

At this time, the magnetic disk substrate 33 is
As shown by a two-dot chain line therein, the center of the uppermost portion of the inner peripheral edge 34 is usually in line contact with the center of the groove 4. Since the bottom surface 4a of the groove 4 is formed in a convex curved shape with a raised central portion, as shown in FIG. 3, when the magnetic disk substrate 33 is inclined from the side, as shown in FIG. Does not contact the bottom surface 4a on the side (side surface 4b side) located in the inclined direction of the uppermost portion of the inner peripheral edge 34, and does not contact the other side (side surface 4c
Side), and contacts the bottom surface 4a of the groove 4 so that the magnetic disk substrate 33
Is supported by the disk support 3 with this portion as a fulcrum P.
Then, gravity causes the center of gravity G of the magnetic disk substrate 33 to be a fulcrum P
, Ie, the magnetic disk substrate 3
3 acts to incline the disk in a direction to cancel the inclination of 3, and the posture of the magnetic disk substrate 33 is returned to the original position. Further, the inclination of the magnetic disk substrate 33 as described above causes the inner peripheral edge 3 of the magnetic disk substrate 33 to rotate as the magnetic disk substrate 33 and the disk support 3 rotate.
The contact point between the groove 4 and the groove 4 is directed toward the side surface 4 c of the groove 4.
The magnetic disk substrate 33 is returned to the center of the groove 4 on the bottom surface 4a of the groove 4 in a spiral shape.

Further, as shown in FIG. 4A, when the magnetic disk substrate 33 is tilted when viewed from above, the magnetic disk substrate 33 and the disk support 3 rotate, thereby causing the magnetic disk substrate 33 to rotate. The contact point between the inner peripheral edge 34 and the groove 4 spirally moves toward one side surface 4b of the groove 4, and the magnetic disk substrate 33 approaches the side surface 4b. However, since the bottom surface 4a of the groove 4 is formed in a convex curved shape in which the central portion is raised, when the magnetic disk substrate 33 deviates from the central portion of the groove 4 as shown in FIG. The magnetic disk substrate 33 is tilted when viewed from the side,
The inclination of the magnetic disk substrate 33 gradually changes from the inclination seen from above to the inclination seen from the side. Then, the inclination of the magnetic disk substrate 33 changes to the inclination viewed from the side as described above, so that the magnetic disk
Is returned to the original position, and at the same time, the magnetic disk substrate 33 is returned to the center of the groove 4.

As described above, according to the disk support 3 of the present invention, even if the magnetic disk substrate 33 is inclined from the side or from above, the posture of the magnetic disk substrate 33 is maintained. Is returned to the original position, and at the same time, the magnetic disk substrate 33 is returned to the center of the groove 4, so that the disk can be reliably supported. Further, contact between the magnetic disk substrates 33 held in the adjacent grooves 4 can be prevented, and the plating of the magnetic disk substrates 33 can be performed favorably. Further, compared with the conventional case where the groove is formed in a V-shape in cross section, a sufficient space around the inner peripheral edge 34 of the magnetic disk substrate 33 can be ensured. 33 can also be performed favorably.

Here, in the above-described embodiment, the bottom surface 4a of the groove 4 is formed in a convex curved shape in which the central portion is raised. However, the present invention is not limited to this. Is also good.

[0018]

According to the disk support of the present invention, even if the disk is inclined when viewed from the side, the gravity moves the center of gravity of the disk directly below the fulcrum, that is, the inclination of the disk. It acts in the direction in which it is lost, and the posture of the disc is restored.
Further, even if the disk is tilted when viewed from above, the tilt of the disk gradually changes from the tilt when viewed from above to the tilt as viewed from the side, so that the attitude of the disk is restored as described above. As described above, according to the disk support of the present invention, the disk is returned to its original position regardless of whether the disk is tilted when viewed from the side or tilted when viewed from above. Plate support can be ensured. Further, contact between the disks held in the adjacent grooves can be prevented, and the surface treatment of the disks can be performed favorably. In addition, since a sufficient space can be secured around the inner peripheral edge of the disk as compared with the case where the groove is formed in a V-shape in cross section as in the conventional case, the surface treatment of the disk in this portion is also possible. Can be performed well.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a schematic configuration of a plating apparatus using a disk support according to an embodiment of the present invention.

FIG. 2 is a side view showing the disk support according to the embodiment.

FIG. 3 is a partially enlarged side view showing a state in which a magnetic disk substrate (disk) is supported by a disk support according to the present embodiment.

FIG. 4 is a diagram showing a state in which a magnetic disk substrate (disk) is supported by the disk support according to the embodiment;
(A) is a partially enlarged plan view, (b) is a partially enlarged side view.

5A and 5B are diagrams illustrating an example of the behavior of a disk when the disk is tilted in a conventional plating apparatus using a disk support, wherein FIG. 5A is a side view, and FIG. It is a part enlarged side view.

FIG. 6 is a plan view showing an example of a behavior of a disk when the disk is inclined in a conventional plating apparatus using a disk support.

FIG. 7 is a side sectional view showing an example of a behavior of a disk when the disk is tilted in a plating apparatus using a conventional disk support.

[Explanation of symbols]

 3 Disk support 4 Groove 33 Magnetic disk substrate (disk)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Atsushi Sakamoto 1-297 Kitabukuro-cho, Omiya-shi, Saitama Mitsubishi Materials Corporation Intelligent Equipment and System Development Center F-term (reference) 4K022 AA31 AA44 DA01 DB15 5D112 AA02 AA24 EE01 KK01

Claims (1)

[Claims] 1. A disc support having a substantially round bar shape, wherein a groove for receiving an inner peripheral edge of a disc having an inner periphery formed on an outer peripheral surface thereof is formed over the entire periphery. A disk support, wherein the groove is formed in a cross-sectional view such that a central portion of a bottom surface is raised to both sides of the bottom surface.